Question about Hyundai ImageQuest HP4240 42 in. Plasma Television

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Plasma wnt stay on

Hello, we havent used the plasma for over a year,the red light is on,when we switch tv on, green light comes on, picture flashes for a second, then it goes back to standby, please help

We turn the plasma on the green light comes on then goes to red and the tv will not come on.

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Power supply fault, really need service manual and multimeter to locate components that are causing the issue.

If it was OK when it went into storage then you may have a dry solder joint on one or more components.

see....
Notes on the Troubleshooting and Repair of Television Sets Version 3.26 (4-Sep-07) Copyright © 1994-2007
Samuel M. Goldwasser
--- All Rights Reserved ---

For contact info, please see the
Sci.Electronics.Repair FAQ Email Links Page.

Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied:

  1. This notice is included in its entirety at the beginning.
  2. There is no charge except to cover the costs of copying.
TV doesn't work after being in storage So the TV you carefully stuffed in a corner of the garages is now totally dead. You swear it was working perfectly a year ago.
Assuming there was absolutely no action when you turned it on, this has all the classic symptoms of a bad connection. These could be cold/cracked solder joints at large components like transformers, power resistors, or connectors and connectors that need to be cleaned or reseated. By 'no action' I mean not even a tweet, bleep, or crackle from anything. To narrow it down further, if careful prodding of the circuit board(s) and various large components with a well insulated stick does not induce the set to come on, even momentarily, check the following:
  1. Locate the horizontal output transistor. It will be in a TO3 metal (most likely on an older set) or TOP3 plastic package on a heat sink. With the set unplugged, confirm that there is no voltage across C to E and then measure between them with an ohmmeter. In at least one direction it should be fairly high - 1K or more. This confirms that the HOT is probably good. (There is also a slight chance that there is a low voltage regulator in addition to the horizontal output, so don't get them confused. The horizontal output transistor will be near the flyback transformer and yoke connector.)
  2. Trace back from the HOT collector to the flyback and through the flyback to the B+ feed from the power supply. Clip a voltmeter between this point and the HOT emitter. Make sure the leads are well insulated and can't accidentally short to anything. (This test can be performed across C to E of the HOT but if the horizontal deflection were to start up unexpectadly, the meter could be damaged by the high voltage pulses on the HOT collector. But if you can't find the B+ source, it may be worth the risk.) Plug it in and turn it on.
    • If the problem is in the low voltage (line) power supply, there will be no substantial voltage across C to E. You should be able to trace from the power line forward to find the bad part though a schematic will help greatly.
    • If the problem is in the startup circuit or horizontal oscillator/driver, then there will be something on the order of 100 to 160 V across C to E. In this case, a schematic may be essential.
There is also a slight chance that there is a low voltage regulator in addition to the horizontal output, so don't get them confused. The horizontal output transistor will be near the flyback transformer and yoke connector.

This text refers to CRT tv's but thought it may be helpfull

Posted on Dec 31, 2007

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Here is a maunal if you think it will be usefull.

reasoner, try to unplug it for some minutes, then conect it back and see f the problem continues.

Posted on Dec 31, 2007

  • Santiago Vallejo
    Santiago Vallejo Dec 31, 2007

    Hi again reasoner,
    If you cant acces or didnt find usefull the first link here you will find a very good troubleshooting and other links to solve your issue.

    If it didnt work, or you want to ask me somthing feel free to do so.

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jerryg50
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SOURCE: plasma wnt stay on

I have had this problem in some models of plasma sets before. In most cases the power supply and main drive boards had to be replaced. In a small number of cases the failure was the screen itself.

In all cases, the cost of the repair was expensive. For the screen failure, the set was scrapped.

Jerry G.

Posted on Apr 12, 2008

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Plasma wnt stay on


I have had this problem in some models of plasma sets before. In most cases the power supply and main drive boards had to be replaced. In a small number of cases the failure was the screen itself.

In all cases, the cost of the repair was expensive. For the screen failure, the set was scrapped.

Jerry G.

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